Column strain insulator



Sept. 18,1923.

L. STIENBERGER COLUMN STRAIN INSULATOR Original Filed Dec. 6, 1918 0" M W N I WITNESS Patented Sept. 18, 1923.

UNITED STATES PATENT oFFIcE.

LOUIS STEINBERGER, OF BROOKLYN, NEW YORK.

COLUMN STRAIN INSULA'I'OR.

To all whom it may concern.

Be it known that I, LoUIs STEINBERGER, a citizen of the United States, and a resident of the borough of Brooklyn, city and State of New York, have invented certain new and useful Improvements in Column Strain Insulators, of which the following is a specification.

My invention relates to a column strain insulator of rod type, and one of the objects thereof is to provide a rod type strain insulator with cup shaped terminals molded into both ends. Another object of the invention is to provide a. rod type strain insulator with cup shaped terminals molded or anchored at both ends, and provided within the terminals with ventilating or cooling ineams. Another object of the invention is to provide a rod type strain insulator with openings for ventilating and cooling at points adjacent the terminals where the insulator is most likely to be heated when in service. Other objects will appear from the subjoined specification and claims.

' Referring to the drawings:

Fig. 1 is a view partly in elevation and partly in section showing a rod type strain insulator embodying my invention.

Fig. 2 is a section on line 2--2 of Fig. 1.

In the drawings in which the same reference characters indicate the same arts in the several views, 10 represents a ody of insulating material which is preferably that material known in the art as electrose. The insulator body is of the rod type and elongated, as shown, and is provided on its periphery with alternate circular ridges 11 and grooves 12, to increase the surface thereof.

Molded or anchored to each end of the insulator body during the process of manufacture are cup shaped metalterminals 13.

Each terminal is exactly the same in construction as the other, and therefore only one need be described. The terminal is hell or cup shaped, as shown, and is provided on its inner edge with a rim or head 14, and in the sides at points substantially 90 degrees from each other are four holes or openings 15, 16, 17 and 18. Extending: from the bell shaped terminal at the central portion there- 1922. Serial No. 562,040.

of is a neck portion 19 and an eyelet 20 at the end thereof for securing purposes.

As stated above, during the process of manufacture, a cup or hell shaped metal terminal is molded into each end of the rod forming the body of the insulator, and the interiorly disposed head 14 at the extreme edge of the hell or cup is for the purpose of anchoring the cup shaped terminal into or upon the insulating material when it is molded thereto. In addition to the bead within the inner rim of the cup I also pr0- vide for anchoring purposes the four apertures above specified which are disposed opposite each other approximately 90 degrees apart and located about centrally in relation to the cup.

As clearly illustrated in the drawings, the apertures are filled with the electrose when the insulator is manufactured, thereby providing additional anchorage and decreasing the likelihood of the cup shaped terminal from being disconnected from the body of electrose. As shown, the electrose flows into these openings and fills them even with the outer surface of the cup.

As shown in the drawings, ll preferably mold two apertures or conduits 30 and 31 at right angles to each other through the ends of the rod or body of the insulator and these apertures or conduits extend in two directions, and are situated preferably substantially at 90 degrees to each other and are for the purpose of ventilating and cooling that portion of the insulator which tends to become heated while in service. These conduits are molded into the insulator at the time it is made and are so formed that the outer edge of the apertures or conduits are a little larger in diameter than at the center portion. This formation is not absolutely necessary to my invention but in actual practice the conduit should be enlarged slightly from the center so that the core can be drawn therefrom more easily.

The outer diameter of each conduit is about three quarters the diameter of the apertures in the side of the metal cup, and the open ends of the conduits are surrounded by the said apertures in the terminal.

My invention is not limited to the provision of two ventilating apertures, as one only may be found suflicient, yet on the other hand more than two may be used, the number being limited only by the required mechanical strength of the insulator at its ends.

It is to be understood that the above description and drawings are merely illustrative and the invention is not to be limited in any respect, except as defined in the subjoined claims.

, Having now described my invention, what I claim as new and desired to secure by Letters Patent is:

1. In a device of the kind described, a rod or body of insulating material provided at each end with a cup shaped terminal, the cup portion having an inwardly disposed bead molded into the insulating material and provided with apertures into which the insulating material is anchored the said insulating rod being provided with ventilating conduits extending transversely through the ends thereof and coincident with but of less diameter than the apertures in the terminal.

2. In a device of the kind described, a rod of insulating material, a cup shaped metal terminal molded to each end thereof the said terminals having apertures in the sides thereof through which the insulating material protrudes, the rod being also provided with a ventilating conduit extending therethrough at each end and passing through the said apertures.

3. in a device of the kind described, a rod of insulating material, a cup shaped metal terminal molded to each end, the said terminals being provided with pairs of apertures in the sides thereof through which the insulating material protrudes, the rod having a plurality of ventilating conduits extending therethrough at each end, each conduit assing through a pair of apertures.

4:. In a device of the kind described, a rod of insulating material, a cup or bell shaped metal terminal molded to each end, the said terminals having apertures in the sides thereof through which the insulating material protrudes, the rod having a ventilating conduit extending therethrough and through apertures in the side ofthe bell shaped portion.

In witness whereof, I have hereunto set my hand at the borough of Manhattan, city and State of New York, this 27th day of November, 1918.

LOUIS STEINBERGER.

In presence of ZITA M. GRAHAM. 

